99ac8d8720
Pass-by-const-ref is not always possible because CameraOptions gets its members modified along the way. Also fixes a case in Map::jumpTo where Update::Zoom should be called if zoom is affected.
433 lines
13 KiB
C++
433 lines
13 KiB
C++
#include <mbgl/map/camera.hpp>
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#include <mbgl/map/transform.hpp>
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#include <mbgl/map/view.hpp>
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#include <mbgl/util/constants.hpp>
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#include <mbgl/util/mat4.hpp>
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#include <mbgl/util/math.hpp>
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#include <mbgl/util/unitbezier.hpp>
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#include <mbgl/util/interpolate.hpp>
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#include <mbgl/util/tile_coordinate.hpp>
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#include <mbgl/platform/platform.hpp>
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#include <cstdio>
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using namespace mbgl;
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/** Converts the given angle (in radians) to be numerically close to the anchor angle, allowing it to be interpolated properly without sudden jumps. */
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static double _normalizeAngle(double angle, double anchorAngle)
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{
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angle = util::wrap(angle, -M_PI, M_PI);
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if (angle == -M_PI) angle = M_PI;
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double diff = std::abs(angle - anchorAngle);
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if (std::abs(angle - util::M2PI - anchorAngle) < diff) {
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angle -= util::M2PI;
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}
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if (std::abs(angle + util::M2PI - anchorAngle) < diff) {
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angle += util::M2PI;
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}
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return angle;
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}
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Transform::Transform(View &view_)
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: view(view_)
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{
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}
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#pragma mark - Map View
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bool Transform::resize(const std::array<uint16_t, 2> size) {
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if (state.width != size[0] || state.height != size[1]) {
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view.notifyMapChange(MapChangeRegionWillChange);
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state.width = size[0];
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state.height = size[1];
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state.constrain(state.scale, state.y);
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view.notifyMapChange(MapChangeRegionDidChange);
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return true;
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} else {
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return false;
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}
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}
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#pragma mark - Position
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void Transform::jumpTo(const CameraOptions& options) {
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CameraOptions jumpOptions(options);
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jumpOptions.duration.reset();
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easeTo(jumpOptions);
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}
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void Transform::easeTo(const CameraOptions& options) {
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CameraOptions easeOptions(options);
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LatLng latLng = easeOptions.center ? *easeOptions.center : getLatLng();
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double zoom = easeOptions.zoom ? *easeOptions.zoom : getZoom();
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double angle = easeOptions.angle ? *easeOptions.angle : getAngle();
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if (!latLng.isValid() || std::isnan(zoom)) {
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return;
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}
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double new_scale = std::pow(2.0, zoom);
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const double s = new_scale * util::tileSize;
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state.Bc = s / 360;
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state.Cc = s / util::M2PI;
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const double m = 1 - 1e-15;
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const double f = std::fmin(std::fmax(std::sin(util::DEG2RAD * latLng.latitude), -m), m);
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double xn = -latLng.longitude * state.Bc;
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double yn = 0.5 * state.Cc * std::log((1 + f) / (1 - f));
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easeOptions.center.reset();
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easeOptions.zoom.reset();
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easeOptions.angle.reset();
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_easeTo(easeOptions, new_scale, angle, xn, yn);
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}
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void Transform::moveBy(const PrecisionPoint& point, const Duration& duration) {
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if (!point.isValid()) {
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return;
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}
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_moveBy(point, duration);
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}
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void Transform::_moveBy(const PrecisionPoint& point, const Duration& duration) {
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double x = state.x + std::cos(state.angle) * point.x + std::sin( state.angle) * point.y;
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double y = state.y + std::cos(state.angle) * point.y + std::sin(-state.angle) * point.x;
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state.constrain(state.scale, y);
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CameraOptions options;
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options.duration = duration;
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_easeTo(options, state.scale, state.angle, x, y);
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}
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void Transform::setLatLng(const LatLng& latLng, const Duration& duration) {
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if (!latLng.isValid()) {
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return;
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}
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CameraOptions options;
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options.center = latLng;
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options.duration = duration;
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easeTo(options);
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}
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void Transform::setLatLng(const LatLng& latLng, const PrecisionPoint& point, const Duration& duration) {
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if (!latLng.isValid() || !point.isValid()) {
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return;
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}
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auto coord = state.latLngToCoordinate(latLng);
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auto coordAtPoint = state.pointToCoordinate(point);
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auto coordCenter = state.pointToCoordinate({ state.width / 2.0f, state.height / 2.0f });
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float columnDiff = coordAtPoint.column - coord.column;
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float rowDiff = coordAtPoint.row - coord.row;
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auto newLatLng = state.coordinateToLatLng({
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coordCenter.column - columnDiff,
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coordCenter.row - rowDiff,
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coordCenter.zoom
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});
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setLatLng(newLatLng, duration);
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}
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void Transform::setLatLngZoom(const LatLng& latLng, const double zoom, const Duration& duration) {
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CameraOptions options;
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options.center = latLng;
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options.zoom = zoom;
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options.duration = duration;
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easeTo(options);
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}
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#pragma mark - Zoom
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void Transform::scaleBy(const double ds, const double cx, const double cy, const Duration& duration) {
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if (std::isnan(ds) || std::isnan(cx) || std::isnan(cy)) {
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return;
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}
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// clamp scale to min/max values
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double new_scale = state.scale * ds;
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if (new_scale < state.min_scale) {
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new_scale = state.min_scale;
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} else if (new_scale > state.max_scale) {
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new_scale = state.max_scale;
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}
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_setScale(new_scale, cx, cy, duration);
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}
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void Transform::setScale(const double scale, const double cx, const double cy,
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const Duration& duration) {
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if (std::isnan(scale) || std::isnan(cx) || std::isnan(cy)) {
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return;
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}
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_setScale(scale, cx, cy, duration);
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}
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void Transform::setZoom(const double zoom, const Duration& duration) {
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if (std::isnan(zoom)) {
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return;
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}
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_setScale(std::pow(2.0, zoom), -1, -1, duration);
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}
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double Transform::getZoom() const {
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return state.getZoom();
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}
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double Transform::getScale() const {
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return state.scale;
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}
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void Transform::_setScale(double new_scale, double cx, double cy, const Duration& duration) {
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// Ensure that we don't zoom in further than the maximum allowed.
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if (new_scale < state.min_scale) {
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new_scale = state.min_scale;
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} else if (new_scale > state.max_scale) {
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new_scale = state.max_scale;
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}
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const double factor = new_scale / state.scale;
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double dx = 0;
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double dy = 0;
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if (cx > 0 || cy > 0) {
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auto coord = state.pointToCoordinate({ cx, state.getHeight() - cy }).zoomTo(state.getZoom());
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auto centerCoord = state.pointToCoordinate({ state.width / 2.0f, state.height / 2.0f }).zoomTo(state.getZoom());
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auto coordDiff = centerCoord - coord;
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dx = coordDiff.column * util::tileSize * (1.0 - factor);
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dy = coordDiff.row * util::tileSize * (1.0 - factor);
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}
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const double xn = state.x * factor - dx;
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const double yn = state.y * factor - dy;
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_setScaleXY(new_scale, xn, yn, duration);
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}
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void Transform::_setScaleXY(const double new_scale, const double xn, const double yn,
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const Duration& duration) {
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CameraOptions options;
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options.duration = duration;
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_easeTo(options, new_scale, state.angle, xn, yn);
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}
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void Transform::_easeTo(const CameraOptions& options, double new_scale, double new_angle, double xn, double yn) {
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CameraOptions easeOptions(options);
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Update update = state.scale == new_scale ? Update::Repaint : Update::Zoom;
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double scale = new_scale;
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double x = xn;
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double y = yn;
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state.constrain(scale, y);
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double angle = _normalizeAngle(new_angle, state.angle);
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state.angle = _normalizeAngle(state.angle, angle);
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double pitch = easeOptions.pitch ? *easeOptions.pitch : state.pitch;
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if (!easeOptions.duration) {
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easeOptions.duration = Duration::zero();
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}
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if (!easeOptions.duration || *easeOptions.duration == Duration::zero()) {
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view.notifyMapChange(MapChangeRegionWillChange);
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state.scale = scale;
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state.x = x;
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state.y = y;
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const double s = state.scale * util::tileSize;
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state.Bc = s / 360;
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state.Cc = s / util::M2PI;
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state.angle = angle;
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state.pitch = pitch;
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view.notifyMapChange(MapChangeRegionDidChange);
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} else {
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view.notifyMapChange(MapChangeRegionWillChangeAnimated);
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const double startS = state.scale;
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const double startA = state.angle;
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const double startP = state.pitch;
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const double startX = state.x;
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const double startY = state.y;
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state.panning = true;
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state.scaling = true;
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state.rotating = true;
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startTransition(
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[=](double t) {
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util::UnitBezier ease = easeOptions.easing ? *easeOptions.easing : util::UnitBezier(0, 0, 0.25, 1);
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return ease.solve(t, 0.001);
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},
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[=](double t) {
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state.scale = util::interpolate(startS, scale, t);
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state.x = util::interpolate(startX, x, t);
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state.y = util::interpolate(startY, y, t);
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const double s = state.scale * util::tileSize;
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state.Bc = s / 360;
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state.Cc = s / util::M2PI;
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state.angle = util::wrap(util::interpolate(startA, angle, t), -M_PI, M_PI);
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state.pitch = util::interpolate(startP, pitch, t);
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// At t = 1.0, a DidChangeAnimated notification should be sent from finish().
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if (t < 1.0) {
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view.notifyMapChange(MapChangeRegionIsChanging);
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}
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return update;
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},
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[=] {
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state.panning = false;
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state.scaling = false;
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state.rotating = false;
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view.notifyMapChange(MapChangeRegionDidChangeAnimated);
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}, *easeOptions.duration);
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}
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}
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#pragma mark - Angle
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void Transform::rotateBy(const double start_x, const double start_y, const double end_x,
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const double end_y, const Duration& duration) {
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if (std::isnan(start_x) || std::isnan(start_y) || std::isnan(end_x) || std::isnan(end_y)) {
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return;
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}
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double center_x = static_cast<double>(state.width) / 2.0, center_y = static_cast<double>(state.height) / 2.0;
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const double begin_center_x = start_x - center_x;
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const double begin_center_y = start_y - center_y;
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const double beginning_center_dist =
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std::sqrt(begin_center_x * begin_center_x + begin_center_y * begin_center_y);
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// If the first click was too close to the center, move the center of rotation by 200 pixels
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// in the direction of the click.
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if (beginning_center_dist < 200) {
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const double offset_x = -200, offset_y = 0;
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const double rotate_angle = std::atan2(begin_center_y, begin_center_x);
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const double rotate_angle_sin = std::sin(rotate_angle);
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const double rotate_angle_cos = std::cos(rotate_angle);
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center_x = start_x + rotate_angle_cos * offset_x - rotate_angle_sin * offset_y;
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center_y = start_y + rotate_angle_sin * offset_x + rotate_angle_cos * offset_y;
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}
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const double first_x = start_x - center_x, first_y = start_y - center_y;
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const double second_x = end_x - center_x, second_y = end_y - center_y;
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const double ang = state.angle + util::angle_between(first_x, first_y, second_x, second_y);
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_setAngle(ang, duration);
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}
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void Transform::setAngle(const double new_angle, const Duration& duration) {
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if (std::isnan(new_angle)) {
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return;
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}
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_setAngle(new_angle, duration);
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}
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void Transform::setAngle(const double new_angle, const double cx, const double cy) {
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if (std::isnan(new_angle) || std::isnan(cx) || std::isnan(cy)) {
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return;
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}
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LatLng rotationCenter;
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if (cx >= 0 && cy >= 0) {
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rotationCenter = state.pointToLatLng({ cx, cy });
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setLatLng(rotationCenter, Duration::zero());
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}
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_setAngle(new_angle);
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if (cx >= 0 && cy >= 0) {
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setLatLng(rotationCenter, { cx, cy }, Duration::zero());
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}
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}
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void Transform::_setAngle(double new_angle, const Duration& duration) {
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CameraOptions options;
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options.angle = new_angle;
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options.duration = duration;
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easeTo(options);
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}
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double Transform::getAngle() const {
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return state.angle;
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}
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#pragma mark - Pitch
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void Transform::setPitch(double pitch, const Duration& duration) {
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CameraOptions options;
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options.pitch = pitch;
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options.duration = duration;
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easeTo(options);
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}
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double Transform::getPitch() const {
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return state.pitch;
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}
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#pragma mark - Transition
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void Transform::startTransition(std::function<double(double)> easing,
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std::function<Update(double)> frame,
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std::function<void()> finish,
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const Duration& duration) {
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if (transitionFinishFn) {
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transitionFinishFn();
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}
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transitionStart = Clock::now();
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transitionDuration = duration;
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transitionFrameFn = [easing, frame, this](const TimePoint now) {
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float t = std::chrono::duration<float>(now - transitionStart) / transitionDuration;
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if (t >= 1.0) {
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Update result = frame(1.0);
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transitionFinishFn();
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transitionFrameFn = nullptr;
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transitionFinishFn = nullptr;
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return result;
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} else {
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return frame(easing(t));
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}
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};
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transitionFinishFn = finish;
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}
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bool Transform::inTransition() const {
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return transitionFrameFn != nullptr;
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}
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Update Transform::updateTransitions(const TimePoint& now) {
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return transitionFrameFn ? transitionFrameFn(now) : Update::Nothing;
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}
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void Transform::cancelTransitions() {
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if (transitionFinishFn) {
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transitionFinishFn();
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}
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transitionFrameFn = nullptr;
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transitionFinishFn = nullptr;
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}
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void Transform::setGestureInProgress(bool inProgress) {
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state.gestureInProgress = inProgress;
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}
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